Spring steel with excellent resistance to hydrogen embrittlement

Details Spring steel with excellent resistance to hydrogen embrittlement Spring steel with excellent resistance to hydrogen embrittlement

1996-10-09

1998-07-07

Yee, Deborah

Metal treatment

Stock

Ferrous

148908, C22C 3802

Patent

active

057762678

ABSTRACT:
The present invention provides a spring steel with excellent performance, characterized in that the spring steel is produced by making a spring steel contain an appropriate amount of at least one or more of Ti, Nb, Zr, Ta, and Hf, thereby generating fine inclusions including carbide, nitride, sulfides and/or their complex compounds, to make the inclusions exert the effect of trapping diffusive hydrogen whereby the resistance to hydrogen embrittlement is enhanced, wherein the size and number of the coarse inclusions are regulated, thereby suppressing the decrease of the fatigue life. The spring steel can provide a valve spring or a suspension spring or the like, with enhanced strength and higher stress resistance, together with improved resistance to hydrogen embrittlement and fatigue.

REFERENCES:
patent: 4909866 (1990-03-01), Abe et al.
patent: 5284529 (1994-02-01), Shikanai et al.
English Abstract of De 1 950 004, Apr. 22, 1971.
English Abstract of De 31 24 977, Apr. 29, 1982.

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